{"id":"CVE-2026-68555","title":"Coturn is a free open source implementation of TURN and STUN Server","summary":"Coturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobi…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400"],"published":"2026-08-19","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:20:38.860","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-68555","references":[{"url":"https://github.com/coturn/coturn/commit/a97f1924bb435bec49d6d91ae01fa2487c2e1bf7","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/releases/tag/4.16.0","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx","label":"security-advisories@github.com"},{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00368,"epssPercentile":0.30687,"ingestedAt":"2026-09-09T21:22:45.544Z","slug":"CVE-2026-68555","body":"## Overview\n\nCoturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobile_begin_transition() in src/server/ns_turn_server.c disarms each new session's allocation timeout and overwrites the allocation's single mobile_pending_resume link, leaving earlier pending sessions unreachable by the cleanup path, while copy_auth_parameters() ignores inc_quota() failure. The attacker can therefore retain unbounded server-side sessions and exhaust process memory even when --user-quota=1 is configured. This issue is fixed in version 4.16.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}